Influence of Pore Water Chemistry on Particle Association and Physical Properties of Lime-Treated Bentonite

IF 2.2 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Minerals Pub Date : 2024-08-02 DOI:10.3390/min14080795

Enza Vitale, Dimitri Deneele, Giacomo Russo

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Abstract

In the present work, an investigation on the influence of the chemical environment on the sedimentation behaviour of bentonite suspensions is performed with particular reference to the effect of lime addition on the clay particle arrangement. The role of lime content, cation valence and source of calcium ions is considered in the experimental work. At the microscale, particle interaction is analysed by means of zeta potential measurements. Soil fabric formation during sedimentation and its physical properties are inferred from dynamic light scattering measurements, sedimentation tests and Atterberg limits. The addition of cations to pore water promotes the flocculation of montmorillonite particles favouring the formation of particle aggregates, whose dimension depends on ion valence and concentration. The final height of sediments reflects the combined effect of the mutual interactions among particles and the development of secondary phases due to pozzolanic reactions. The influence of clay mineralogy and its effects on the physical properties of lime-treated bentonite is highlighted by comparison with experimental evidence on lime-treated kaolin.

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孔隙水化学对石灰处理膨润土颗粒团聚和物理性质的影响

本研究调查了化学环境对膨润土悬浮液沉降行为的影响，特别是石灰添加对粘土颗粒排列的影响。实验工作考虑了石灰含量、阳离子价和钙离子源的作用。在微观尺度上，通过 zeta 电位测量分析了颗粒之间的相互作用。通过动态光散射测量、沉积试验和阿特伯格极限推断沉积过程中土壤结构的形成及其物理性质。在孔隙水中加入阳离子会促进蒙脱石颗粒的絮凝，有利于形成颗粒聚集体，其尺寸取决于离子价和浓度。沉积物的最终高度反映了颗粒之间相互影响的综合效应，以及由于水胶反应而形成的次生相。通过与石灰处理过的高岭土的实验证据进行比较，突出了粘土矿物学的影响及其对石灰处理过的膨润土物理性质的影响。

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来源期刊

Minerals MINERALOGY-MINING & MINERAL PROCESSING

CiteScore

4.10

自引率

20.00%

发文量

1351

审稿时长

19.04 days

期刊介绍： Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.